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37 lines
755 B
37 lines
755 B
// Copyright (c) 2016 The Bitcoin Core developers |
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// Distributed under the MIT software license, see the accompanying |
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// file COPYING or http://www.opensource.org/licenses/mit-license.php. |
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/** Functions for measurement of CPU cycles */ |
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#ifndef H_PERF |
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#define H_PERF |
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#include <stdint.h> |
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#if defined(__i386__) |
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static inline uint64_t perf_cpucycles(void) |
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{ |
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uint64_t x; |
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__asm__ volatile (".byte 0x0f, 0x31" : "=A" (x)); |
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return x; |
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} |
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#elif defined(__x86_64__) |
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static inline uint64_t perf_cpucycles(void) |
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{ |
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uint32_t hi, lo; |
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__asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi)); |
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return ((uint64_t)lo)|(((uint64_t)hi)<<32); |
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} |
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#else |
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uint64_t perf_cpucycles(void); |
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#endif |
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void perf_init(void); |
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void perf_fini(void); |
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#endif // H_PERF
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